Well my problem is my wires aren't good and got cut in the attic by mistake and new ones with the stupid rca plug bose puts on there are not easy to find. I will get the ones from ready shack I am sure they will work okay
Yes, run the 50ft of 14ga wire from your rear speakers all the way to the sub and then splice with the old wire about a 6" - 12" from the RCA jack. that way only a foot or less will be using the old wire.
Will 12ga wire actually fit into the Bose spring clips on the cube speaker?
Forgive me but, imho, using these heavier cables is kinda pointless. If you don't like the ones you have, simply put an RCA plug on the end of some decent twinlead from Home Depot. Or see what they have at RadioShack like this http://www.radioshack.com/product/in...ductId=2102959